Direct methanol fuel cells with streamline graded structure under ultra-low fuel stoichiometry condition

Seunghun Jung, Chao Yang Wang

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Operating a direct methanol fuel cell (DMFC) with ultra-low fuel stoichiometry is desirable to build a compact portable power system. Through 3D computational modeling with statistical analysis, severe non-uniformity of fuel concentration leading to high methanol crossover in the inlet region and poor fuel supply in the outlet region is predicted under ultra-low fuel stoichiometry condition, which causes large voltage loss or even cell shut-down. After identifying controlling parameters of methanol transport, this paper proposes streamline-graded structures (SGS) of the anode channel to mitigate anode fuel distribution non-uniformity and to boost cell performance and fuel efficiency together. Computational results show that streamline-graded structures achieve about 10% of voltage gain and 3% of fuel efficiency improvement compared to the conventional DMFC design by mitigating anode non-uniformity.

Original languageEnglish (US)
Pages (from-to)253-264
Number of pages12
JournalJournal of Power Sources
Volume248
DOIs
StatePublished - Jan 1 2014

Fingerprint

Direct methanol fuel cells (DMFC)
Stoichiometry
fuel cells
stoichiometry
methyl alcohol
nonuniformity
Anodes
anodes
Methanol
Electric potential
electric potential
outlets
acceleration (physics)
cells
statistical analysis
Statistical methods
crossovers
causes

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

Cite this

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abstract = "Operating a direct methanol fuel cell (DMFC) with ultra-low fuel stoichiometry is desirable to build a compact portable power system. Through 3D computational modeling with statistical analysis, severe non-uniformity of fuel concentration leading to high methanol crossover in the inlet region and poor fuel supply in the outlet region is predicted under ultra-low fuel stoichiometry condition, which causes large voltage loss or even cell shut-down. After identifying controlling parameters of methanol transport, this paper proposes streamline-graded structures (SGS) of the anode channel to mitigate anode fuel distribution non-uniformity and to boost cell performance and fuel efficiency together. Computational results show that streamline-graded structures achieve about 10{\%} of voltage gain and 3{\%} of fuel efficiency improvement compared to the conventional DMFC design by mitigating anode non-uniformity.",
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Direct methanol fuel cells with streamline graded structure under ultra-low fuel stoichiometry condition. / Jung, Seunghun; Wang, Chao Yang.

In: Journal of Power Sources, Vol. 248, 01.01.2014, p. 253-264.

Research output: Contribution to journalArticle

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